Not much, most possible functions are similar to what you've already seen. Can't give any special abilities. The only possible effects on quests, mobs and items are to give or deduct Health, Attack, Defense, Stamina, Energy and Gold. No way to get an item to raise your max stats.

- Piggy Bank: gives you the possibility of depositing and withdrawing gold. (+ a daily/weekly bonus on gold that is stored in your piggy bank)- Inventory: gives you the possibility to store health/attack/defense potions and allows the usage in battle